Specification:

Vibration: silence / vibration 
Waterproof level: IP67 
Compatible system: Android 4.3 and above, iOS version 8 and above 
Main features: heart rate, pedometer, calorie, distance, stopwatch, sleep monitoring, blood pressure
Call reminder, alarm clock reminder 
Screen size: 0.87 inches OLED 
Screen type: OLED 
Bluetooth: 4.0BLE (low power) 
Battery type: lithium polymer battery 
Battery capacity: 60mAh 
Charging method: USB dedicated charging line 
Charging time: about 1.5H 
Control mode: key control, mobile phone APP control 
Product language: Chinese / English 
Bracelet size: L*W*H=40.3*15.7*11MM 
Wrist size: length 235MM, adjustable length 155-210MM 
Appearance material: body - plastic wristband -- thermoplastic elastomer, Aluminum Alloy 
Product color: black, green, orange, blue 

Package Included : 
1 x Y2 Bluetooth smart bracelet 
1 x Charging Cable 
1 x User Manual